#include <Stepper.h>
#include <LiquidCrystal_I2C.h>

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4
#define ENCODER_CLK 2
#define ENCODER_DT  3

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

const int btn1 = 5;
const int btn2 = 4;
const int led1 = 6;
const int sw = 7;
int cnt = 0;
int enc = 0;

// Initialize the stepper library on pins 8 through 11:
const int motor_pin_1 = 8;
const int motor_pin_2 = 9;
const int motor_pin_3 = 10;
const int motor_pin_4 = 11;
int hf20 = 400;
Stepper myStepper(hf20, motor_pin_1, motor_pin_2, motor_pin_3, motor_pin_4);

void setup() {
  myStepper.setSpeed(40);
  lcd.init();
  lcd.backlight();
  pinMode(ENCODER_CLK, INPUT);
  pinMode(ENCODER_DT, INPUT);
  attachInterrupt(digitalPinToInterrupt(ENCODER_CLK), readEncoder, FALLING);
  pinMode(sw, INPUT_PULLUP);
  pinMode(btn1, INPUT_PULLUP);
  pinMode(btn2, INPUT_PULLUP);
  pinMode(led1, OUTPUT);
  lcd.setCursor(0,0);
  lcd.print("Stepper OwO");
  lcd.setCursor(0, 1);
  lcd.print("ArkanAsadilHuda");
  delay(1000);
  lcd.clear();
}

void readEncoder() {
  int dtValue = digitalRead(ENCODER_DT);
  if (dtValue == HIGH) {
    enc += 10;
  }
  if (dtValue == LOW) {
    enc -= 10;
  }
}


void loop() {
  hf20 = enc;
  if (digitalRead(sw) == LOW) {
    if (enc + cnt >= 0) {
    digitalWrite(led1, LOW);
    myStepper.step(hf20);
    cnt += hf20;
    } else {
      lcd.setCursor(0, 1);
      lcd.print("Negative number!");
      delay(1000);
      lcd.clear();
    }
  } else {
    digitalWrite(led1, HIGH);
  }
  lcd.setCursor(0, 0);
  lcd.print("Step:");
  lcd.println(cnt);
  lcd.setCursor(0, 1);
  lcd.print("Sel:");
  lcd.println(hf20);
  lcd.setCursor(9 ,1);
  lcd.print("T:");
  lcd.println(enc + cnt);
}